Organization and Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding and Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator for basic and diluted earnings per share:
Net income	$ 3,884	$ 4,457	$ 7,275	$ 7,755
Denominator:
Weighted average shares outstanding-basic	53,383	51,109	53,287	51,923
Dilutive effect of stock-based awards	1,372	1,744	1,641	1,776
Diluted weighted average shares outstanding	54,755	52,853	54,928	53,699
Anti-dilutive stock-based awards excluded	361	1,235	309	1,234
Net income per common share:
Basic	$ 0.07	$ 0.09	$ 0.14	$ 0.15
Diluted	$ 0.07	$ 0.08	$ 0.13	$ 0.14